linux-kernel - Re: gettimeofday(), clock_gettime(), timer

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Message-ID: <1f1b08da0607260908u753684c5ocda8b361db65227b@mail.gmail.com>
Date:	Wed, 26 Jul 2006 09:08:46 -0700
From:	"john stultz" <johnstul@...ibm.com>
To:	"John Richard Moser" <nigelenki@...cast.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: gettimeofday(), clock_gettime(), timer_gettime()

On 7/25/06, John Richard Moser <nigelenki@...cast.net> wrote:
> I'm looking through a few things and noticing some complaints about time
> and performance.  Briefly, the following things have come to my attention:
>
>  - gettimeofday() is slow, or so they say, needing several milliseconds
> to execute.

No. At worse its several microseconds (PIT takes about 18us, and its terrible!).
More likely you'll see ~1us using ACPI PM or HPET or ~500-100ns
(depending on your system).  With vsyscall it can get into the sub
100ns range.

thanks
-john
-
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